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HESI A2 2024 CHEMISTRY EXAM QUESTIONS
Qs and Ans Expert- Explanation
This Exam contains:
-Guarantee passing score -100 Questions and Answers -format set of multiple-choice -Expert- Explanation
Question 1: physical properties are either?
Answer:
INTENSIVE OR EXTENSIVE
Question 2: atoms that share electrons are?
Answer:
COVALENT
Question 3: what is a cation?
Answer:
A POSITIVE ION
- Formed when an atom loses one or more electrons
Question 4: for representative elements, the last digit of the group number reveals?
Answer:
THE NUMBER OF OUTER LEVEL ELECTRONS
- The position of the element in the table reveals its electronic configuration and how it differs in atomic
size
Question 5: what is conduction?
Answer:
A FORM OF HEAT TRANSFER THAT REQUIRED CONTACT
Question 6: what is a chemical bond?
Answer:
INVOLVES A NEGATIVE-POSITIVE ATTRACTION B/W ELECTRONS AND NUCLEUS OF ATOMS
- Form/ break atoms when they gain, lose, or share an electron in the outer valence shell
- A union b/w the electron structures of atoms
Question 7: what is periodicity?
Answer:
ALLOWS US TO PREDICT AN ELEMENTS REACTIVITY BASED ON ITS POSITION ON THE TABLE
- The most important feature of the table is its arrangement according to periodicity, or the predictable
trends observed by atoms
Question 8: the formula for volume of a cube?
Answer:
LENGTH OF ONE SIDE CUBED
- a3
Question 9: what are representative elements?
Answer:
ELEMENTS WITH THE S AND P ORBITALS FILLING
- They are in groups 1, 2, 13-17
- They are chemically very reactive metals and nonmetals and can attain the nearest noble gas
configuration by losing or gaining the electrons from their valence shell
Question 10: what is a covalent bond?
Answer:
THE SHARING OF VALENCE ELECTRONS TO BECOME STABLE
- A type of chemical bonding
Question 11: what is specific heat capacity?
Answer:
A CONSTANT THAT RELATES HEAT TRANSFER TO CHANGES IN TEMP
- The amount of heat required to raise 1 gram of a substance by 1 degree celsius
- Heat capacity per unit mass
- Each element has its own specific heat
Question 12: what is a liquid?
Answer:
MOLECULES/ ATOMS MOVE AROUND AND HAVE WEAK BONDS, BUT NOT WEAK ENOUGH TO
READILY BREAK
- Volume remains constant but takes shape of container
- High density
- Move past each other freely
Question 13: properties of water
Answer:
WATER IS A LIQUID AT ROOM TEMP, HAS A HIGH SPECIFIC HEAT POINT, IT RESISTS HEAT
AND MOTION LEADING TO HIGH BOILING POINT/ VAPORIZATION POINT
- Is cohesive so water is drawn toi itself
- Is adhesive so draws other molecules (cohesive + adhesive = good solvent)
- Substances w/ polar ions and molecules easily dissolve in water
Question 14: intensive properties
Answer:
DO NOT DEPEND ON THE AMOUNT OF MATTER OR QUANTITY OF THE SAMPLE
- Will not change if sample size is increased/decreased
Question 15: what are hydrogen bonds?
Answer:
REFER TO THE TYPE OF ATTRACTION IN AN ELECTRONEGATIVE ATOM SUCH AS OXYGEN (O),
FLUORINE (F), OR NITROGEN (N)
- Weaker than covalent/ ionic bonds
Question 16: a negative ion is when?
Answer:
ATOMS GAIN ELECTRONS
Question 17: the states of matter can be traversed by?
Answer:
ADDITION/ REMOVAL OF HEAT
- Additional heat must be added to overcome latent heat
Question 18: covalent bond electronegativity
Answer:
FORMED WHEN 2 ATOMS W/ THE SAME ELECTRONEGATIVITY BOND TOGETHER
- If 2 atoms have a difference in electronegativity by 0.5, then they're joined by this bond
Question 19: atoms can bond together to make?
Answer:
MOLECULES
Question 20: the number of electrons determine?
Answer:
HOW ATOMS INTERACT W/ EACH OTHER
- Decide if the atom as a whole is positive, negative, or neutral
Question 21: what is matter?
Answer:
MATTER REFERS TO SUBSTANCES THAT HAVE SPACE AND OCCUPY MASS (OR VOLUME)
- Has 3 states: solid, liquid, gas
Question 22: extensive properties
Answer:
DO DEPEND ON THE AMOUNT OF MATTER/ QUANTITY OF A SAMPLE
- Change if sample size is increased/ decreased
Question 23: what is ionization?
Answer:
THE PROCESS WHERE NEUTRAL PARTICLES ARE IONIZED INTO CHARGED PARTICLES
- Convert to an ion
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